What does it mean that red team your own schemas?

Deliberately try to break your own mental model before relying on it.

Example: You've built a schema that says 'senior engineers resist process changes because they're set in their ways.' Before you design an entire change management strategy around this belief, you red team it: What if they resist because the proposed processes actually are worse? What if they resist because they've seen three similar initiatives fail? What if the ones who seem resistant are actually the ones with the most context? Each attack reveals a different failure mode in your original schema — and the schema that survives this assault is dramatically more useful than the one you started with.

Try this: Pick one belief you currently hold with high confidence — about your career, your team, a market trend, or a personal relationship. Write it as a single declarative statement. Now spend 10 minutes writing the strongest possible case against it. Do not write a weak objection you can easily dismiss. Write the version that a smart, well-informed adversary would make — the argument that, if true, would force you to abandon or significantly revise your schema. If you cannot generate a strong counterargument, you do not understand your own position well enough to defend it.